A space cushion is a barrier inside the car that you hold, if necessary, allowing room to maneuver. The space cushion checks regularly and keeps other vehicles' attention. and other option are not correct that can be defined as:
In option a, There is no use of passenger seat in space cushion.
In option b, It is used by the driver but not the driver's seat.
In option c, Space cushion provides a buffer around your vehicle not inside the vehicle.
